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Price would be a major advantage, but if you buy most off the shelf computers, they already have Windows installed so you have already incurred the cost. Security would also be an advantage - aside from the different architecture of Ubuntu, there just isn’t that large of an install base to make it worthwhile for most bad guys to target. You can also change the appearance easily. On the other hand, getting peripherals to work can be much more of a headache with Ubuntu than Windows, at least for the average user.